Electrical coil



I S. E. ADAIR.

ELECTRICAL COIL.

APPLICATION FILED FEB. 20. I9I8. I

Patented Mar. 14, 1922.

l I I `-`x` wfzz III I ,1, 9 p H /4 I u di III -I I "/a I I I I I Im: II

I/ Il 3 /6 a IIIIIIII IIIIIIIIIFI II III I II I I I I ll I III IIIII\II\ HH/mm 7 IIIII l d UNITED STATES PNT OFFICE.

SAMUEL E. ADAIR. OIE' NEW YORK, N. Y., ASSIG- NOR TO WESTERN ELECTRICCOMPANY,

. INCORPORATED, 0F NEW YORK, N. Y., A CORPORATION OE NEW YORK.

ELECTRICAL COIL.

Application led February 20, 1918. Serial IO. 212,279.

T 0 all whom it may concern:

Beit known that I, SAMUnL l. Amin, a citizen of United States, residingat New York, in the `county of lNew York, State of New York, haveinvented certain new and useful Improvements in Electrical Coils, otwhich the following is a. full, clear, concise, and exact description.

This invention -relates to electrical coils, and more Iparticularly tosuch coils used in connection with radio communication for tuning andsimilar purposes. The object ot the invention is to provide a. coil inwhich the distributed Vcapacity is reduced to a.

minimum.

In continuous la'yer windings there is a distributed capacity Aeffectwithinl the winding itself due to the difference inv potential betweenturns, this capacity eilect being' inversely proportional to the spacingbetween the turns. In many electrical circuits, particularly those inthe -ield ot wireless telegraphy and wireless telephony, there is ademand for coils in which the udistributed capacity is eliminated orgreatly reduced, for example, a coil-with such characteristics isparticularly desirable as a tuning` coil, since it permits much `sharpertuning than is otherwise obtainable.

In order to obtain a coil havinga low distributed cap'acity 'and at thesame time one which is not prohibitive in size or ditlicult to windcommercially, the present invention ber 1, which is preferabl;v ot

lodd number ot guide pins or spind provides a windingin which theadjacent turns do not lie next to one another but cross one another at arather blunt angle irequent intervals around the circumference ot theWinding.

This construction will. be more clearly understood by reference to theaccompanying drawing which shows in perspective au inductance'coil woundin the proposed Referring to this drawing. the b insulating materlah'isprov are also of wood or simiiar ma spindleaiwhich are numl elusive, areset perpendi itself. insulated c? it v7hich is secured a peroraspecification qftettersraam. i Patented Mar, 14, 1932,

at the terminal.\ rIhis conductor is then carried directly to spindle 4,thence to the alternate spindles 6, 8, 10 and 12 in order.

From spindle 12, the conductor is carried to spindle 3 and the secondturn is made by winding about spindles 3, 5, 7 9, 11 and 2. Thus, aftertwo complete turns, the conductor is again brought tospindle 2 and thebalance of the winding may beplaced in the same manner. After completingthe last turn, the conductor is given a complete turn around spindle 3to aid in holding the winding in place and itis then led throughlthevpertoration 16 in base 1 and securely fastened to terminal 17 Afterthe Winding is completed it is preferably given a coat ot shellac at thespindles to prevent shitting of' the turns.

lVith the construction as described and shown on the drawing, -it willbe noted that adjacent turns come in contact` with each other only atthe points where they cross between spindles, as at the points 1S1S. Atall other points they Yare separated rfrom each other by a distancewhich reaches a maximum at the spindles. As a result ot this increasedseparation between turns. the distributed capacity of the coil isreduced a considerable amount. lllolreoverhthis reduction in capacity isaccomplished `without ap- 'preciably affecting the size of the coil orwithout distributing the iux leakage and thereby decreasing theinductanceot a cori having? given number of turns.

wWhat is claimed is:

1. 'in electrical coil comprising' a plurality oiY symmetrical polygonturns adjacent turns having their dihedral angles angularly displaced wlli respect to each other.

'Ln electrical coil comprising a plurality of; syn'nnetrical polygonturns. adjan cent turns having their dihedral angles an- ,frularidisplaced with respect to each other. and alternate turns having" theirdihedral angles in alignment..

3.1% n electrical coil comprising' a base member having a plurality otspindles mounted thereon. said spindles being; o'li'an odd number, and`a conductor wound upcviz, said spindles, adjacent turns ot said wind-,if angrularly displaced 'with respect other and alter wie turns beingin ent with each other with respect to member having an odd number ofspindles mounted thereon and perpendicular liereto, and :1 Windinghavinga plu ziliy of turns, each of said turns being Wound upon elernziespindles.

5. ln electrinl coil comprising n base member having an odd number ofspindles mounted thereon and perpendicular thereto, und d continuousWinding wound successively on alternate spindles.

ln witness ,Vliereof, I hereunto subscribe my name this 14th day ofFebruary A. D., 1918.

SLMUEL E. ADAR.

